Because glutathione levels decline as you age, and glycine can help slow the glutathione slide, it's a good idea to keep your levels high by eating protein rich foods, like organic poultry, grass fed Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation Construction of a novel highly selective NIR probe for monitoring the changes of glutathione levels in drug induced liver injury Chemical Communications (RSC Publishing) The use of antioxidants in liver disease by James Kyffin British Veterinary Nursing AssociationBritish Veterinary Nursing Association